# Prove that Honeycomb Structures are the Most Geometrically Efficient Structure

I was reading this paragraph and it got me thinking:

The closed ends of the honeycomb cells are also an example of geometric efficiency, albeit three-dimensional and little-noticed. The ends are trihedral (i.e., composed of three planes) sections of rhombic dodecahedra, with the dihedral angles of all adjacent surfaces measuring 120°, the angle that minimizes surface area for a given volume. (The angle formed by the edges at the pyramidal apex is approximately 109° 28' 16" (= 180° - arccos(1/3)).)

This is hardly intuitive; is there a proof of this somewhere?

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## migrated from physics.stackexchange.comFeb 23 '11 at 8:26

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not really physics that I can tell. probably belongs in math.stackexchange –  Mark Eichenlaub Feb 23 '11 at 3:47
i remember reading somewhere that the bees didnt use the best possible (but very close and optimized wrt some other variable). –  yoyo Feb 23 '11 at 16:01

If you want to divide space up into uniform volume cells with minimum surface area, the honeycomb is not optimal. Look at the Weaire–Phelan structure. While honeycombs are not quite optimal, they are certainly close enough for bees -- they're suboptimal by only 0.3%.

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+1 nice    –  draks ... Mar 30 '12 at 19:08

It is called geometrically efficient because it is densely packed.